本文選題：光纖拉曼放大 + 摻鉺光纖放大�。� 參考：《北京郵電大學(xué)》2015年碩士論文

【摘要】：隨著長距離無中繼光纖通信系統(tǒng)的不斷發(fā)展,人們對光纖放大器的性能要求也越來越高。在這種背景下,混合光放大器開始引起科研人員的關(guān)注。混合光放大器是一種將光纖拉曼放大器與摻鉺光纖放大器或者光纖拉曼放大器與光纖參量放大器混合使用,相互彌補(bǔ)從而實現(xiàn)超寬帶、平坦化增益的光中繼器。在長距離光纖通信中,要實現(xiàn)多路信號的傳輸,就需要保證光放大器的增益譜足夠平坦。本文通過建模仿真對比的方式,對多波長混合光放大器增益譜平坦化進(jìn)行了研究,并通過差分進(jìn)化算法實現(xiàn)了對增益譜平坦度的優(yōu)化。本論文的主要工作和成果如下： (1)介紹了FRA、EDFA、FOPA的原理、結(jié)構(gòu)和分類。并通過建模仿真的方式探究了影響三種光纖放大器增益譜的因素,比如,泵浦功率、泵浦波長、光纖長度、光纖有效面積等。為后面增益譜的優(yōu)化的研究提供了理論依據(jù)。 (2)介紹了優(yōu)化增益譜所使用的差分進(jìn)化算法的原理,并探究了如何利用差分進(jìn)化算法優(yōu)化增益譜平坦度,畫出優(yōu)化流程圖。利用這個方法對雙泵浦FRA增益譜進(jìn)行優(yōu)化,得到增益帶寬為28nm、增益波動約為1.6dB的增益譜。驗證了利用智能優(yōu)化算法優(yōu)化增益譜的可行性。改變算法的優(yōu)化參數(shù),就可以對具有更多泵浦的混合光放大器的增益譜進(jìn)行優(yōu)化。為后面優(yōu)化混合放大增益譜打下基礎(chǔ)。 (3)建立二階泵浦FRA模型并進(jìn)行仿真,探究一階泵浦和二階泵浦功率的搭配方式,對比了不同搭配方式下,一階泵浦光、二階泵浦光和信號光沿著光纖的功率分布情況,最終得到最優(yōu)的搭配方式,為后面二階泵浦拉曼-參量光纖混合放大增益的優(yōu)化提供了理論依據(jù)。 (4)分別建立多泵浦拉曼-摻鉺光纖混合放大和二階泵浦拉曼-參量光纖混合放大模型并進(jìn)行仿真,基于差分進(jìn)化算法對它們的增益譜平坦度進(jìn)行優(yōu)化,分別得到增益帶寬為93nm、增益波動1.4dB和增益波動1.2dB的增益譜。驗證了本文通過混合放大器的使用并對其增益譜進(jìn)行優(yōu)化來實現(xiàn)寬帶平坦化增益的可行性。
[Abstract]:With the development of long distance non-secondary optical fiber communication system, the performance of fiber amplifier is becoming more and more important.In this context, hybrid optical amplifiers began to attract the attention of researchers.Hybrid optical amplifier is an optical repeater which uses fiber Raman amplifier and erbium-doped fiber amplifier or fiber Raman amplifier and fiber parametric amplifier to make up for each other so as to achieve ultra-wideband and flatter gain.In long distance optical fiber communication, the gain spectrum of optical amplifier must be flat enough to realize multichannel signal transmission.In this paper, the gain spectrum flatness of multi-wavelength hybrid optical amplifier is studied by modeling and simulation, and the flatness of gain spectrum is optimized by differential evolution algorithm.The main work and results of this thesis are as follows:The principle, structure and classification of FRAA EDFAA FOPA are introduced.The factors influencing the gain spectrum of three kinds of fiber amplifiers are discussed by modeling and simulation, such as pump power, pump wavelength, fiber length, fiber effective area and so on.It provides a theoretical basis for the optimization of gain spectrum.This paper introduces the principle of differential evolution algorithm used to optimize gain spectrum, and probes into how to optimize the flatness of gain spectrum by using differential evolution algorithm, and draws the flow chart of optimization.The gain spectrum of double-pumped FRA is optimized by this method. The gain bandwidth is 28nm and the gain fluctuation is about 1.6dB.The feasibility of using intelligent optimization algorithm to optimize gain spectrum is verified.The gain spectrum of a hybrid optical amplifier with more pumps can be optimized by changing the optimized parameters of the algorithm.It lays the foundation for the later optimization of the mixed amplification gain spectrum.The second order pump FRA model is established and simulated, and the collocation of the first order pump and the second order pump power is explored. The power distribution of the first order pump light, the second order pump light and the signal light along the fiber is compared under different collocation modes.Finally, the optimal configuration is obtained, which provides a theoretical basis for the later second-order pumped Raman parametric fiber hybrid amplification gain optimization.(4) Multi-pump Raman doped fiber hybrid amplification model and second-order pumped Raman parametric fiber hybrid amplification model are established and simulated, and their gain spectrum flatness is optimized based on differential evolution algorithm.The gain spectra of gain fluctuation 1.4dB and gain fluctuating 1.2dB are obtained respectively with gain bandwidth of 93 nm.The feasibility of realizing wideband flattening gain by using hybrid amplifier and optimizing its gain spectrum is verified in this paper.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN722;TN929.11

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